Make 2D canvas smarter about chosing whether or not to use GPU acceleration

Source/modules/webgl/WebGL2RenderingContextBase.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/webgl/WebGL2RenderingContextBase.h"
 
 #include "bindings/modules/v8/WebGLAny.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLImageElement.h"
@@ skipping 628 matching lines @@
 }
 
 void WebGL2RenderingContextBase::texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLenum format, GLenum type, HTMLCanvasElement* canvas, ExceptionState& exceptionState)
 {
     if (isContextLost() || !validateHTMLCanvasElement("texSubImage3D", canvas, exceptionState))
         return;
 
     if (!canvas->renderingContext() || !canvas->renderingContext()->isAccelerated()) {
         ASSERT(!canvas->renderingContext() || canvas->renderingContext()->is2d());
         // 2D canvas has only FrontBuffer.
-        texSubImage3DImpl(target, level, xoffset, yoffset, zoffset, format, type, canvas->copiedImage(FrontBuffer).get(),
+        texSubImage3DImpl(target, level, xoffset, yoffset, zoffset, format, type, canvas->copiedImage(FrontBuffer, PreferAcceleration).get(),
             WebGLImageConversion::HtmlDomCanvas, m_unpackFlipY, m_unpackPremultiplyAlpha);
         return;
     }
 
     // FIXME: Can we do an accelerated copy in this case?
     notImplemented();
 }
 
 void WebGL2RenderingContextBase::texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLenum format, GLenum type, HTMLVideoElement* video, ExceptionState& exceptionState)
 {
@@ skipping 2083 matching lines @@
 GLenum WebGL2RenderingContextBase::boundFramebufferColorFormat()
 {
     if (m_readFramebufferBinding && m_readFramebufferBinding->object())
         return m_readFramebufferBinding->colorBufferFormat();
     if (m_requestedAttributes.alpha())
         return GL_RGBA;
     return GL_RGB;
 }
 
 } // namespace blink